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Segment Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segments:                      
Revenue $ 2,264.5 $ 1,922.2 $ 1,917.9 $ 1,742.0 $ 2,196.2 $ 1,865.5 $ 1,876.1 $ 1,676.0 $ 7,846.6 $ 7,613.8 $ 7,537.1
Segment operating income                 938.0 871.9 788.4
Interest expense                 90.6 85.8 84.9
Interest income                 20.1 22.8 27.4
Other expense, net (26.2) [1] $ 6.1 [1] $ (0.1) [1] $ (17.1) [1] (10.3) [1] $ (37.2) [1] $ 0.5 [1] $ 0.3 [1] 37.3 46.7 10.2
Income before income taxes                 830.2 762.2 720.7
Depreciation and amortization of fixed assets and intangible assets                 160.2 157.0 163.0
Capital expenditures                 200.7 161.1 148.7
Assets 12,485.2       12,585.1       12,485.2 12,585.1  
IAN                      
Segments:                      
Revenue                 6,318.9 6,144.9 6,076.3
Segment operating income                 895.3 847.4 774.0
Depreciation and amortization of fixed assets and intangible assets                 117.7 117.5 124.5
Capital expenditures                 149.2 117.5 92.0
Assets 10,660.0       10,738.2       10,660.0 10,738.2  
CMG                      
Segments:                      
Revenue                 1,527.7 1,468.9 1,460.8
Segment operating income                 189.9 166.3 163.9
Depreciation and amortization of fixed assets and intangible assets                 19.5 18.4 18.5
Capital expenditures                 16.6 12.7 11.7
Assets 1,428.3       1,338.6       1,428.3 1,338.6  
Corporate and Other                      
Segments:                      
Segment operating income                 (147.2) (141.8) (149.5)
Depreciation and amortization of fixed assets and intangible assets                 23.0 21.1 20.0
Capital expenditures                 34.9 30.9 $ 45.0
Assets $ 396.9       $ 508.3       $ 396.9 $ 508.3  
[1] The three months ended March 31 and December 31, 2016 included pre-tax losses of $16.3 and $25.3, respectively, on sales of businesses. The three months ended September 30 and December 31, 2015 included pre-tax losses of $38.0 and $12.0, respectively, on sales of businesses.